Our new to us boat has the motors but no arms or blades. How do you figure the lengths for articulating arms and blades?
*It's been I while since I went through this, but this is my recollection:
Using existing motors, my first thought to install articulated arms/blades*was to consider*the desired swept area of the glass when viewed from the pilothouse.* The number was 11".
I then installed*articulated arms with 11" blades, and the motors could barely move them with dry glass, just a little faster with wet glass.* Used them a couple of months, and even tried RainX to lubricate, but it soon wore off.* Downsized to 8" blades which worked for a couple of years.
Then, rewired the boat which included an analysis on wire size needed to supply 12VDC power to the (3) wiper motors.* It became very obvious that the #16 wire with a 45' round trip was not adequate for the amperage demand, and the circuit was rewired with a #8 supply wire.
Have reinstalled the 11" blades, and everything works good.